package com.atguigu.gulimall.order.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.utils.R;
import com.atguigu.common.vo.MemberRespVo;
import com.atguigu.gulimall.order.constant.OrderConstant;
import com.atguigu.gulimall.order.constant.OrderStatusEnum;
import com.atguigu.gulimall.order.dao.OrderItemDao;
import com.atguigu.gulimall.order.entity.OrderItemEntity;
import com.atguigu.gulimall.order.feign.CartFeignService;
import com.atguigu.gulimall.order.feign.MemberFeignService;
import com.atguigu.gulimall.order.feign.ProductFeignService;
import com.atguigu.gulimall.order.feign.WmsFeignService;
import com.atguigu.gulimall.order.interceptor.LoginUserInterceptor;
import com.atguigu.gulimall.order.service.OrderItemService;
import com.atguigu.gulimall.order.to.OrderCreateTo;
import com.atguigu.gulimall.order.vo.*;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import org.bouncycastle.pqc.crypto.rainbow.util.ComputeInField;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.order.dao.OrderDao;
import com.atguigu.gulimall.order.entity.OrderEntity;
import com.atguigu.gulimall.order.service.OrderService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;


@Service("orderService")
public class OrderServiceImpl extends ServiceImpl<OrderDao, OrderEntity> implements OrderService {

	private ThreadLocal<OrderSubmitVo> orderSubmitVoThreadLocal = new ThreadLocal<>();

	@Autowired
	RabbitTemplate rabbitTemplate;

	@Autowired
	OrderItemService orderItemService;

	@Autowired
	MemberFeignService	memberFeignService;

	@Autowired
	CartFeignService cartFeignService;

	@Autowired
	ThreadPoolExecutor executor;

	@Autowired
	WmsFeignService wmsFeignService;

	@Autowired
	StringRedisTemplate redisTemplate;

	@Autowired
	ProductFeignService productFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<OrderEntity> page = this.page(
                new Query<OrderEntity>().getPage(params),
                new QueryWrapper<OrderEntity>()
        );

        return new PageUtils(page);
    }

	@Override
	public OrderConfirmVo confirmOrder() throws ExecutionException, InterruptedException {
		OrderConfirmVo confirmVo = new OrderConfirmVo();
		MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
		//获取当前线程请求
		RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

		CompletableFuture<Void> getAddressFuture = CompletableFuture.runAsync(() -> {
			//共享主线程的请求
			RequestContextHolder.setRequestAttributes(requestAttributes);
			//1、远程查询所有的收货地址列表
			List<MemberAddressVo> address = memberFeignService.getAddress(memberRespVo.getId());
			confirmVo.setAddressVos(address);
		}, executor);

		CompletableFuture<Void> cartFuture = CompletableFuture.runAsync(() -> {
			RequestContextHolder.setRequestAttributes(requestAttributes);
			//2、远程查询购物车所有选中的购物项
			List<OrderItemVo> items = cartFeignService.getCurrentUserCartItems();
			confirmVo.setItems(items);
		},executor).thenRunAsync(()->{
			List<OrderItemVo> items = confirmVo.getItems();
			List<Long> collect = items.stream().map(item -> item.getSkuId()).collect(Collectors.toList());

			R hasStock = wmsFeignService.getSkusHasStock(collect);
			List<SkuStockVo> data = hasStock.getData(new TypeReference<List<SkuStockVo>>(){});
			if (data!=null){
				Map<Long, Boolean> map = data.stream().collect(Collectors.toMap(SkuStockVo::getSkuId, SkuStockVo::getHasStock));
				confirmVo.setStocks(map);
			}
		},executor);

		//3、查询用户积分
		Integer integration = memberRespVo.getIntegration();
		confirmVo.setIntegeration(integration);

		//其他数据自动计算

		//TODO 5、防重令牌
		String token = UUID.randomUUID().toString().replace("-", "");
		redisTemplate.opsForValue().set(OrderConstant.USER_ORDER_TOKEN_PREFIX+memberRespVo.getId(),token,30, TimeUnit.MINUTES);
		confirmVo.setOrderToken(token);

		CompletableFuture.allOf(getAddressFuture,cartFuture).get();

		return confirmVo;
	}

	@Transactional
	@Override
	public SubmitOrderResponseVo submitOrder(OrderSubmitVo vo) {
    	orderSubmitVoThreadLocal.set(vo);
    	SubmitOrderResponseVo responseVo = new SubmitOrderResponseVo();
		MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();
		responseVo.setCode(0);
		//1、验证令牌【令牌的对比和删除必须保证原子性】
		//0为令牌失败 1为删除成功
		String script = "if redis.call('get',KEYS[1]) == ARGV[1] then return redis.call('del',KEYS[1]) else return 0 end";
		String orderToken = vo.getOrderToken();
		//原子验证令牌和删除令牌
		Long result = redisTemplate.execute(new DefaultRedisScript<Long>(script, Long.class), Arrays.asList(OrderConstant.USER_ORDER_TOKEN_PREFIX + memberRespVo.getId()), orderToken);
		if (result==0L){
			//令牌验证失败
			responseVo.setCode(1);
			return responseVo;
		}else {
			//令牌验证成功
			//下单：去创建订单，验令牌，验价格，锁库存。。。
			//1.创建订单，订单项等信息
			OrderCreateTo order = createOrder();
			//2.验价
			BigDecimal payAmount = order.getOrder().getPayAmount();
			BigDecimal payPrice = vo.getPayPrice();
			if (Math.abs(payAmount.subtract(payPrice).doubleValue())<0.01){
				//3保存订单
				saveOrder(order);
				//4.锁定库存。只要有异常回滚订单数据。
				//订单号，所有订单项（skuId,skuName,num）
				WareSkuLockVo lockVo = new WareSkuLockVo();
				lockVo.setOrderSn(order.getOrder().getOrderSn());
				List<OrderItemVo> locks = order.getOrderItems().stream().map(item -> {
					OrderItemVo itemVo = new OrderItemVo();
					itemVo.setSkuId(item.getSkuId());
					itemVo.setCount(item.getSkuQuantity());
					itemVo.setTitle(item.getSkuName());
					return itemVo;
				}).collect(Collectors.toList());
				lockVo.setLocks(locks);
				//TODO 4、远程锁库存
				R r = wmsFeignService.orderLockStock(lockVo);
				if (r.getCode() == 0){
					//锁成功了
					responseVo.setOrder(order.getOrder());

					//TODO 订单创建成功发送消息给MQ
					rabbitTemplate.convertAndSend("order-event-exchange","order.create.order",order.getOrder());
					return responseVo;
				}else {
					//锁定失败
					Object msg =(String) r.get("msg");
					// throw NoStockException(msg);
					responseVo.setCode(3);
					return responseVo;
				}

			}else {
				responseVo.setCode(2);
				return responseVo;
			}
		}
	}

	@Override
	public OrderEntity getOrderByOrderSn(String orderSn) {
		OrderEntity order_sn = this.getOne(new QueryWrapper<OrderEntity>().eq("order_sn", orderSn));
		return order_sn;
	}

	@Override
	public void closeOrder(OrderEntity entity) {
    	//查询当前这个订单的最新状态
		OrderEntity byId = this.getById(entity.getId());
		if (byId.getStatus() == OrderStatusEnum.CREATE_NEW.getCode()){
			//关闭订单
			OrderEntity update = new OrderEntity();
			update.setId(entity.getId());
			update.setStatus(OrderStatusEnum.CANCLED.getCode());
			this.updateById(update);
			OrderTo orderTo = new OrderTo();
			BeanUtils.copyProperties(byId,orderTo);
			//发给MQ一个释放库存的消息
			rabbitTemplate.convertAndSend("order-event-exchange","order.release.other",orderTo);
		}
	}

	@Override
	public PageUtils queryPageWithItem(Map<String, Object> params) {
		MemberRespVo memberRespVo = LoginUserInterceptor.loginUser.get();

		IPage<OrderEntity> page = this.page(
				new Query<OrderEntity>().getPage(params),
				new QueryWrapper<OrderEntity>().eq("member_id",memberRespVo.getId()).orderByDesc("id")
		);

		List<OrderEntity> order_sn = page.getRecords().stream().map(order -> {
			List<OrderItemEntity> itemEntities = orderItemService.list(new QueryWrapper<OrderItemEntity>().eq("order_sn", order.getOrderSn()));
			order.setItemEntities(itemEntities);
			return order;
		}).collect(Collectors.toList());
		page.setRecords(order_sn);
		return new PageUtils(page);
	}

	//保存订单数据
	private void saveOrder(OrderCreateTo order) {
		OrderEntity orderEntity = order.getOrder();
		orderEntity.setModifyTime(new Date());
		this.save(orderEntity);

		List<OrderItemEntity> orderItems = order.getOrderItems();
		orderItemService.saveBatch(orderItems);
	}


	private OrderCreateTo createOrder(){
    	OrderCreateTo createTo = new OrderCreateTo();
    	//1、生成订单号
		String orderSn = IdWorker.getTimeId();
		//创建订单号
		OrderEntity orderEntity = buildOrder(orderSn);

		//2、获取到所有的订单项
		List<OrderItemEntity> itemEntities = buildOrderItems(orderSn);

		//3、计算价格相关
		computePrice(orderEntity,itemEntities);

		createTo.setOrder(orderEntity);
		createTo.setOrderItems(itemEntities);

		return createTo;

	}

	private void computePrice(OrderEntity orderEntity, List<OrderItemEntity> itemEntities) {
    	BigDecimal total = new BigDecimal("0.0");

		BigDecimal coupon = new BigDecimal("0.0");
		BigDecimal integration = new BigDecimal("0.0");
		BigDecimal promotion = new BigDecimal("0.0");

		BigDecimal gift = new BigDecimal("0.0");
		BigDecimal growth = new BigDecimal("0.0");
		//订单的总额，叠加每一个订单项的总额信息
		for (OrderItemEntity entity : itemEntities) {
			coupon = coupon.add(entity.getCouponAmount());
			integration = integration.add(entity.getIntegrationAmount());
			promotion = promotion.add(entity.getPromotionAmount());
			total = total.add(entity.getRealAmount());
			gift = gift.add(new BigDecimal(entity.getGiftIntegration().toString()));

			growth = growth.add(new BigDecimal(entity.getGiftGrowth().toString()));
		}
		//1、订单价格相关
		orderEntity.setTotalAmount(total);
		//应付总额
		orderEntity.setPayAmount(total.add(orderEntity.getFreightAmount()));
		orderEntity.setPromotionAmount(promotion);
		orderEntity.setIntegrationAmount(integration);
		orderEntity.setCouponAmount(coupon);

		//设置积分等信息
		orderEntity.setIntegration(gift.intValue());
		orderEntity.setIntegration(growth.intValue());
		orderEntity.setDeleteStatus(0);//未删除
	}

	//构建所有订单项数据
	private List<OrderItemEntity> buildOrderItems(String orderSn) {
    	//最后确定每个购物项的价格
		List<OrderItemVo> currentUserCartItems = cartFeignService.getCurrentUserCartItems();
		if (currentUserCartItems!=null && currentUserCartItems.size()>0){
		  List<OrderItemEntity> itemEntites = currentUserCartItems.stream().map(cartItem -> {
			  OrderItemEntity itemEntity = buildOrderItem(cartItem);
			  itemEntity.setOrderSn(orderSn);
			  return itemEntity;
		  }).collect(Collectors.toList());
		  return itemEntites;
	  }
		return null;
	}

	//构建某一个订单项
	private OrderItemEntity buildOrderItem(OrderItemVo cartItem) {
		OrderItemEntity itemEntity = new OrderItemEntity();
		//1.订单信息：订单号
		//2、商品的SPU信息
		 Long skuId = cartItem.getSkuId();
		R r = productFeignService.getSpuInfoBySkuId(skuId);
		SpuInfoVo data = r.getData(new TypeReference<SpuInfoVo>() {
		});
		itemEntity.setSpuId(data.getId());
		itemEntity.setSpuBrand(data.getBrandId().toString());
		itemEntity.setSpuName(data.getSpuName());
		itemEntity.setCategoryId(data.getCatalogId());


		//3、商品的sku信息
		itemEntity.setSkuId(cartItem.getSkuId());
		itemEntity.setSkuName(cartItem.getTitle());
		itemEntity.setSkuPic(cartItem.getImage());
		itemEntity.setSkuPrice(cartItem.getPrice());
		String skuAttr = StringUtils.collectionToDelimitedString(cartItem.getSkuAttr(), ";");
		itemEntity.setSkuAttrsVals(skuAttr);
		itemEntity.setSkuQuantity(cartItem.getCount());
		//4.优惠信息[不做]
		//5、积分信息
		itemEntity.setGiftGrowth(cartItem.getPrice().intValue());
		itemEntity.setGiftIntegration(cartItem.getPrice().intValue());
		//订单项的价格信息
		itemEntity.setPromotionAmount(new BigDecimal("0"));
		itemEntity.setCouponAmount(new BigDecimal("0"));
		//当前订单项的实际金额
		itemEntity.setIntegrationAmount(new BigDecimal("0"));
		BigDecimal orgin = itemEntity.getSkuPrice().multiply(new BigDecimal(itemEntity.getSkuQuantity().toString()));
		BigDecimal subtract = orgin.subtract(itemEntity.getPromotionAmount())
				.subtract(itemEntity.getCouponAmount())
				.subtract(itemEntity.getIntegrationAmount());
		itemEntity.setRealAmount(subtract);


		return itemEntity;
	}

	private OrderEntity  buildOrder(String orderSn) {
		OrderEntity entity = new OrderEntity();
		entity.setOrderSn(orderSn);

		OrderSubmitVo submitVo = orderSubmitVoThreadLocal.get();

		//获取收货地址信息
		R fare = wmsFeignService.getFare(submitVo.getAddrId());
		FareVo fareResp = fare.getData(new TypeReference<FareVo>() {
		});
		//设置收货人信息
		entity.setReceiverCity(fareResp.getAddress().getCity());
		entity.setReceiverDetailAddress(fareResp.getAddress().getDetailAddress());
		entity.setReceiverName(fareResp.getAddress().getName());
		entity.setReceiverPhone(fareResp.getAddress().getPhone());
		entity.setReceiverPostCode(fareResp.getAddress().getPostCode());
		entity.setReceiverProvince(fareResp.getAddress().getProvince());
		entity.setReceiverRegion(fareResp.getAddress().getRegion());

		//设置订单的相关状态信息
		// entity.setStatus();


		return entity;
	}

}
